Levels of Consciousness:

The levels of consciousness range from being fully alert to being deeply asleep. They are mainly distinguished from each other by their brain wave frequency. It is also important to note that there are no rigid boundaries separating them. Instead, the levels blend into each other, as described below:

Beta: Full Consciousness (14- 30 Cycles per Second)

Alpha: Twilight period between being asleep and being awake:Meditation, Relaxation (9-13 cycles per second)

Theta: Deep sleep or relaxation (4-8 Cycles per Second)

Delta: Deep Dreamless sleep (1 -3 Cycles per Second)

Above 30 Cycles per Second is Hyper Active Level and Below 0 Cycles per Second Coma State. 

Beta is the state of total consciousness- the normal state.

Alpha and Theta is the category of altered state of consciousness. These are the states when behavior modifications are most likely to take place.

Suggestions given in these states go directly into the subconscious mind without any interference from the analytical conscious mind. The subconscious mind has no power of reasoning and will accept the suggestions as they are and will act upon them.